Spins and microstructure of hydrogenated amorphous carbon: A multiple frequency electron paramagnetic resonance study

von Bardeleben, H. J.; Cantin, J. L.; Zeinert, A.; Racine, B.; Zellama, K.; Hai, P. N.
May 2001
Applied Physics Letters;5/7/2001, Vol. 78 Issue 19, p2843
Academic Journal
Polymer-like and diamond-like hydrogenated amorphous carbon films, characterized by high spin concentrations of 10[sup 20] cm[sup -3], have been studied by multiple frequency electron paramagnetic resonance (EPR) spectroscopy at 9, 35, and 94 GHz. Whereas the low-frequency measurements show only one single symmetric EPR line, the high-frequency measurements reveal the anisotropic nature of the g tensor. They show the presence of two different paramagnetic centers with anisotropic g tensors of g[sub ||](1)=2.005, g[sub ⊥](1)approx. 2.003, and g[sub ||](2)=2.010, g[sub ⊥](2)approx. 2.003. We attribute both to localized π states on nanosized sp[sup 2] graphitic clusters. The g[sub ||] values of the g tensors, which are correlated to the size of the graphite like carbon clusters, indicate two different cluster sizes with values below 50 Å. © 2001 American Institute of Physics.


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